Cylinder for paper-pulp machines



, a 1,619,052 March 1927' N. H. BERGSTROM CYLINDER FOR PAPER PULPMACHINES Filed July 21, 1924 4 Sheets-Sheet 1 INVENTOR.

' 192 7 N. H. BERGSTROM CYLINDER F03 PAPER PULP MACHINE-S Filed Ju1yv21, 1924 4 Sheets-Sheet 2 IN V EN TOR.

March 1 1927. 1,619,052

N. H. BERGSTROM CYLINDER FOR PAPER PULP MACHINES Filed July 21, 1924 4Shaina-sheet 3 1, 1 March 1927' N. H. BERGSTROM 6 CYLINDER FOR PAPERPULP MACHINES Filed July 21, 1924 4 Sheets-Sheet 4 INVENTOR.

Patented Mar. 1, 192 7.

PATENT NATHAN'I'I. BERGSTROM, OF NEENAHfWISCQNSIN.

CYLINDER FOR PAPER-PULP MACHINES.

Applicationfiled. July 21,1924. Seria1"No."727,237.

This invention relates to improvements in paper pulp cleaning machines,and more particularly to a cylinder for the. same.

In the manufacture of paper, either from rags or'from wood pulp, it iscustomaryto first subject the pulp to the action of water to removeforeign matter from the pulp before it is treated with chemicals. Forthis purpose, a plurality ofconnected to- :gether compartments are usedand a drum is revolved in each compartment. The drums are covered withwire meshing and the pulp in each compartment. is subjected to jets ofwater to cleanse thesame. Each drum is eccentrica-lly mounted within itscompartment and as it revolves it squeezes the pulp against thecompartment wall to free the same from the dirty water, and the pulp iscarried to the next compartment. The dirty water 'passes'tl'irough thewire meshing .of the *dru-m-and is directed from the compartment.

It is,"therefore, one of the objects of the present invention to providea cylinder-of the class mentioned, constructed to permit thereadyreplac'ementof the wire meshing DI screens.

-A further object of the invention is to provide a cylinder of the"class described in whieh'the grates, provided to support and protectthescreens, are removable from'the drum with, or independently, of thescreens.

A further object of'the invention is to' provide a cylinder-for paperpulp machines of sectional construction to permit the easy removal ofany of the parts for repairs or replacement.

A further object of the invention is to V which is of very simpleconstruction, is eflicient in operation, is strong and durable, and iswell adapted for the purpose described;

\Vith the above and other objects in View, the invention consists of theimproved cylinr derfor paper pulp machines and. its parts andcombinations as set forth in the claims, and all equivalents thereof.

In the accompanying drawing, in which the same reference charactersindicate the same parts in allof the views:

Fig. 1 is a side view of the improved cylinder for paper pulp machines,part being broken away and shown in section;

Fig. 2 is an end view of the cylinder, part being broken away and shownin section;

Fig. 3'is an enlarged fragmentary j'detail. 'VIBVV to show the headjoint construction;

Fig. 4- is a sectional view taken on line 4-4 of Fig. 3;

Fig. 5 is a-section'al View taken on line -55 of Fig. 3; p

Fig. 6 is a fragmentary'view of theinner face of one of the) drum heads;

F ig. 7 is across-sectional view of a drum head; p i

' Fig. 8 is a side view-of the tapered cylinder member;

Fig. 9 'isan'end view thereof Fig. 10 is a plan View of one of thegrates employed; i

Fig. 11 is a plan view of a screen frame; Fig. 12 is an end-view of agrate;

Fig. 13 is an end view ofa screen frame;

Fig. 14 is a side- View of a drum head connecting baryand A 1 Fig. 15isan end view thereof.

Referring now more particularly to the drawing, it will be seen th'atuthe numeral *20' indicates the improved cylinder which is in-the form -ofa drum of octagonal shape.

The? drum "heads 21 are of octagonal form with edge portions '22. Theinner surfaces of thefedge portions 22"are formed with progatedconnecting bars 25 are provided, said bars being shapedasfshown'in Fig.1a and positioned-as shown in Fig. 2. The. connecting bars 25 are formedwith enlarged ends 26 adapted to be positioned against the head portions23 and said ends 26 are provided with apertures 27 registrable with thebolt holes 23 to permit the bolting of the connecting bars to the headedge portions.

The drum frame iscovered by eight grate members 28 secured thereto bymeans here inafter to be explained. "The mid-portions of the grates areraised and provided with transverse bars 29 while .the flanged edges 30of the grates are formed to receive frames 31 provided to securescreening 32 to the exposed faces of the grates, it being observed thatthe screening is interposed between the grates and the framesBl, and istightly stretched and clamped in position by means of said frames, asshown in Figs. 1 and 2. To provide for the ready removal of the gratesand screening to permit replacement or repairsthe drum head portions 22are provided with slotted openings 33 and the edge portions of thegrates 28 and the screen frames 31 have corresponding slots 34 and 35,respectively. The grates and screen frames 31 are positioned on the drumframe members 22 so that the slots 33. 34 and 35 register. Headed bolts36 are then slipped therein and are clamped in position by means of nuts37.

Referring more particularly to Figs. 1. 6 and 7 it will be seen that thedrum head end portions 24 are formed with inwardly projecting ribs 38,and secured to the ribs. longitudinally of the drum, are sheets of metal39. curved to form buckets, for the purpose hereinafter to be explained.

The drum head portions 24 are further formed with centrally positionedbored hubs 4O toreceive shafts 41 which are wedgingly fitted within saidhubs, andthe inner end portions of said shafts are reduced, as at 41,and the shafts are held against with 'drawal from the hubs by nuts v44threaded onto the reduced end portions 41 and held thereon by pins 45.The shafts 41 project outwardly from the drum heads and are journaled inthe sides of the tank in which the drum is positioned, affording meanswhereby the drum may be rotated.

The inner end portions of the hubs are reduced, as at 42, to removablyreceive a cylinder member 43, as shown in Fig. 1, said cylinder memberbeing preferably formed in the shape of a double cone, the greatestdiameter of hich is at approximately the center of the drum. Referringto Fig. 2. it Will be seen that the alternate bucket plates 39 are of asize sufficient to reach the surface of the cylinder, and are secured topulp is squeezed between the tank sides and the screens 32. A relativelylarge proportion of the dirty Water will pass through the screens intothe interior of the drum. This water is caught by the bucket plates 39and due to the sloping of the cylinder member 43, it will flow in bothdirections to the opposite ends of said drum and out through annularpassageways 47 provided therefor in the drum head members. 7

Ubviously,1the entire cylinder may be readily disassembled to permitrepairs and replacement of parts inasmuch as all of the constituentunits are bolted together in a manner 'to permit the quick removal ofany unit. v

From the foregoing description. it will be seen that the improvedcylinder for paper pulp machines is of very simple and novelconstruction, and is well adapted for the purpose set forth.

hat I claim as my invention is:

1. A cylinder for paper pulp machines, comprising a rotatable polygonalframe, a cylinder member of double conical shape removably securedwithin said frame, spaced bucket members within said frame for directingliquid to the surface of said cylinder member. longitudinally extendinggrate members removably secured to the frame, and screen membersremovably secured to the frame and grate members.

2.v In a cylinder for paper pulp machines having a frame and a cylinderwithin the frame, bucket members also within the frame. grate memberscarried by the frame and forming sides, side frames clamped to saidgrate members; and screening interposed between said grate members andsaid side frames.

In testimony whereof, I afiix my signature.

NATHAN H. BERGSTROM,

